Constantinos
| Name | Constantinos |
| Type | Steamer |
| GRT | 3,014 tons |
| Country |  Greek |
| Built | 1893 |
| Builder | J. L. Thompson & Sons, Sunderland |
| Operator | P. Constantinidis, P. Cavafis & Co., Piraeus |
| History |
U-boat attacks on Steamer Constantinos
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 24 Jun 1917 | UC 65 (Otto Steinbrinck) | Sunk | about 25 miles off Cape Ferrat | Bona - Glasgow | ore | 0 |
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